Weighing-scale.



T. 0. PROUTY.

WEIGHING SCALE. APPLICATION FILED FEB.17, 1909.

Patented Nov'. 21, 19.11.

' UNITED STATES PATENT- OFFICE.

THEODORE C. IRQUTY, OF IUJ'RORA, ILLINOIS.

WEIGI-IING-SCALE.

Specification of Letters Patent. I Patented Nov. 21,1911.

Application filed February 17, 1909. Serial No. 478,468;

To all whom it may concern:

Be it known that I, THEODORE C. PRoU rY,

a citizen of the United States, residing at Aurora, in the county ofKane and State of Illinois, have invented certain new and usefulImprovements in lVeighing-Scales, of

which theLfolloWing is a specification, reference being had to theaccompanying drawings.

This invention relates to weighing scales, and has for its object toprovide a new and improved form of scale employing a pivotedcounterbalance lever for supporting the plat-- form or pan and attachedparts.

More particularly the object of my inven tion is to provide a new andimproved construction of such scale which shall do away with thenecessity for maintaining the scale constantly' n any partlcularposltion, by which improved construction accurate results can beobtained even though the scale a is tipped slightly one way or anotherfrom the normal position. I accomplish this object by the means shown inthe drawings and hereinafter specifically described.

That which I believe to be new will be set forth in the claims.

In the accompanying drawings :---Figure 1 is a front elevation of myimproved con struction as applied to a scale adapted to be suspended.Fig. 2 is a side elevation of .the same.

the blocks 11, this construction forming a pivotal support for saidarms.

Near the points where the arms l3.1 1 are attached to said-rings 16there. are attached to the upper surfaces of said rings two flexiblebands 18, one band being attached to each ring, said bands extending upoverthe rings and thence downward between them, the lower ends of thebands being secured between two strips 19, at the lower ends of whichstrips is secured aweighing pan 20. I

21 indicates a plate depending from" the crossbar 10 and provided with agraduated reading scale, and 22 indicates a pointer secured to saidstrips 19. The reading scale is of.course graduated and positioned onthe plate 21 so that when there is no loadupon the pan 20 the pointer 22stands directly at 0., ,and so that the pointer will'at all timesindicate the exact pressure or weight upon the pan.

By this construction I have found that I can do away entirely with .thenecessity for using any high degree of accuracy in leveling the scaleeither in the course of its manufacture or when it is being set upreadyfor use. For example, in case the scale of Fig. 1 should be *tiltedslightly to the left at its upper end, the arm 13 would tend to assume aposition at a slightly wider angle with the central longitudinal line ofthe plate 21 than it now occupies, tending to loosen the band 18connected with such arm and thus somewhat decreasing thefett'ective'nesSof such arm in supporting the pan 20. At the same time the arm 14 wouldtend to stand at a wider angle from the vertical, thus increasing theefiectiveness of such arm in supporting the pan 20. I have found thatthe increase in effectiveness of the arm, 14 in such case will offsetthe decrease in effectiveness of the arm 13, the only change being thatthe arm 13 supports a smaller proportion of the weight of the pan whilethe arm 14: supports a correspondingly greater proportion of suchweight. The eifectis that with no load on the pan the pointer remains atO after the scale is tilted, and that accurate results in weighing canstill be obtained. 7 By my invention I have provided a construction ofscale which can be produced very cheaply, a construction that is free ofsprings or other parts liable to get out of order or to deteriorate withage or use, and a construction which though very simple is neverthelessvery accurate and effective and Which does not require any fineadjustments on account of being shifted from one point to another. 7 I aWhat I claim as my invention and desire to secure by Letters Patentis 1. The combination .with a supporting plate, two weighted levers eachof which comprises a ring at one end, a grooved sup-' porting block foreach lever, and a blade adapted to bear in said groove, said supportingblock and said blade being carried one by said supporting plate and theother by .said ring whereby each lever is adapted to the lower ends ofsaid connect-ions, and'aj graduated scale and a pointer, one of which iscarried by said pan and the other of which is carried by said plate,adapted to indicate the force of the downward pull on said connections.2. The combination with a supporting plate, two supporting blocksmounted thereon, each of said supporting blocks being pro'vided with agroove in itsupper face,

, and two weighted levers each comprising a ring atone end and a bearingblade projecting inward therefrom, said rings being, adapted to beslipped over the free ends ,of said bearing blocks and said bearingblades [being adapted ,to rest in said grooves, of

flexible connections extending over said rings and attached to saidlevers whereby a pull downward on said connections is adapted to raisesaid levers, a pan connected to the lower ends of said'connections, anda graduated scale and a pointer, one of which is carried by said pan andthe other of which is carried by'said plate, adapted to indicate theforce of the downward pull on Copies of this patent. may be obtained forfive cents each, by addressing the Commissioner of Patents,

downward on said connections is adapted."v

to'raise said levers, and a pan connected to the lower ends of saidconnections.

4:. The combination of a'supporting plate, two supporting blocks mountedthereon, each of said supporting blocks being provided with agroove inits upper face, two weighted levers each comprising a ring at one endand a bearing blade projecting inward therefrom to a point above thecenter thereof, said rings being adapted to be slipped over the freeends of said bearing blocks and said bearingblades being adapted to restin said grooves, flexible connections extending over saidrings andattached to said levers whereby a downward pull on said connections isadapted to raise said levers, and a pan connected to the lower ends ofsaid connections.

THEODORE O. PROUTY. Witnesses:

ALBERT H. ADAMS, WILLIAM H. DE BUsK.

Washington, D. G.

